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Global QoS (Quality of Service) constraint decomposition is an important strategy for service composition, and QoS aggregation calculation is the key to service optimization. A constraint strength aware global QoS constraint decomposition model is proposed by introducing a relaxation factor that can be adjusted adaptively according to fuzzy reasoning rules. The improved K-means algorithm is adopted to avoid the combined explosion problem in the process of QoS aggregation calculation. Simulationdoi:10.24507/ijicic.16.04.1409 fatcat:yku7ovmxxbe2lp6pm7u42jgl64